Port state control is playing more important role in the international maritime monitoring as a supplementary of flag supervision, whose ship selection mechanism has a vital role in using the limited port state control resources effectively. 港口国监督(PSC)作为船旗国监督的补充在国际海事监管中正发挥着越来越重要的作用,其选船机制对于有效利用有限的港口国监督资源具有举足轻重的作用。